President's Day fun, testudo, and who really invented the telephone?

Today is President's Day in the US, and I've come into the office on my day off to post for my readers (to be fair, I would have come in anyway, my home computer is unavailable at the moment). We will examine the handedness of presidents, Ronald Reagan's sex appeal, a couple of notable presidential incidents, and the list of fictional presidents as part of the celebration, as well as a common Roman infantry tactic and the Elisha Gray vs. Alexander Bell debate.